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Chkdsk basically checks your disks for errors. I have encountered a lot of boot loop problems in our offices and what I basically do is just run the W7 installer, go to the repair tools that comes with it, go to cmd prompt, then do a chkdsk /f to the computer's drives. After chkdsk, all is ok.

There i'm again checkdisk is no option. When i go to the cmd and type chkdsk /f there's a text message. Type filesystem are Ntfs but the then there's a message can't lock active station volume are write protected. What now?

If push comes to shove, you can try chkdsk c: /f /r /x. Use c: if that is the correct drive letter for your hard drive. The /x will force the drive to dismount first, cutting any open handles to the drive.

If that doesn't do it, I'd say malware, and move this topic over to the appropriate forum.

Did you or did you not...get asked whether you want to run the chkdsk /r command upon boot?

It's normal for Windows to assert that it cannot run the chkdsk /r command on the Windows partition...while booted into Windows, That's why it runs upon reboot, before the Windows partition is actively used.